modernize build system #507

Job	Run time
build-docs (3.8)	3m 44s
build-mpi (3.9)	1m 30s
build-jax (3.8)	1m 40s
build-mpi (3.10)	1m 35s
build-numpy (3.8, short)	41s
build-jax (3.9)	46s
build-numpy (3.8, optimize)	42s
build-jax (3.10)	49s
build-torch (3.8)	2m 0s
build-numpy (3.8, multivariate)	40s
build-torch (3.9)	3m 38s
build-numpy (3.8, optimize-experimental)	41s
build-torch (3.10)	2m 26s
build-numpy (3.9, short)	52s
build-numpy (3.9, optimize)	46s
build-numpy (3.9, multivariate)	40s
build-numpy (3.9, optimize-experimental)	42s
build-numpy (3.10, short)	42s
build-numpy (3.10, optimize)	44s
build-numpy (3.10, multivariate)	48s
build-numpy (3.10, optimize-experimental)	44s
	26m 50s

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